[2016-04-13][codeforces][447][A][DZY Loves Hash].md
#include<cstdio>#include<cstring>using namespace std;const int maxn = 300 + 10;int a[maxn];int main(){int p,n,tmp;memset(a,-1,sizeof(a));scanf("%d%d",&p,&n);for(int i = 0; i < n ; ++i){scanf("%d",&tmp);if(a[tmp % p] != -1){printf("%d\n",i+1);return 0;}else a[tmp%p] = tmp;}printf("-1\n");return 0;}
[2016-04-13][codeforces][447][A][DZY Loves Hash]
原文:http://www.cnblogs.com/qhy285571052/p/56404708b0654295d91637484752f523.html